I recently bought a 4k Hisense TV. When I connected my computer to the display, small green dots appeared across the entire display. I tried updating my drivers, but nothing changed. I looked at the resolution settings. Recommended resolution for this display is 3840x2160, but when I changed it to 1920x1080, the dots all cleared up. I tried all the other resolutions above 1920x1080 and they would have even more green dots than the 3840x2160 resolution. Anyone know if this is a hardware problem or limitation? I thought it was strange that the recommended resolution was having problems...

As far as the cable goes, I only have one and sadly don't know anyone that has the same cable type that I can borrow. I don't believe it is a cable problem as all resolutions above and below 1920x1080 have the same problem.

The output port on the laptop is a Micro Display Port and connects to HDMI port on the TV. I know it is not the HDMI port on the TV, as I have tried other devices on that port and they all worked fine.

I ran through all the different update methods you provided, though the initial update did download and successfully install, it did not fix the green dot problem. I tried the manual install, but it said I already had the most recent update.

I recommend you to test the behavior of the system with another cable, it is possible that the video signal is compromised from one end to the other while using adapters (Mini Display Port to HDMI) our recommendations in those terms (when it is required to use an adapter) is to get an active adapter (Mini DP to HDMI active adapter to be searched), that has a specialized chip that converts the video output from A to B which can help with these type of issues.

I have tested with all the different drivers you suggested, however none of them worked.

Sadly I haven't had an opportunity, and can't afford to get a new cable/adapter right now. I know the problem is not with my TV as I've tested other 4k devices on it since my last posting, so I'm guessing it is the cable or port on my computer, as you said before. Running the display to the tv, there is quite a bit of lag with fast moving things, however when running on my native laptop display, there are no problems so I'm pretty sure processor isn't the problem.